Review on Stay Refreshed with PunPun Insulated Perfect Drinking Approved! by Christopher Pfaffe

I have bought several of these mugs and given them away as gifts. They're less likely to break than other brands I've had. They are the perfect size for my Nespresso capsules. However, they still have problems. Today I noticed that there is condensation and even water in one of the cups in the air space. I can only assume that the seal at the bottom of the cup has not survived. I think it's still functional, it just looks awful. But I just noticed on this site that the manufacturer doesn't recommend putting it in the microwave. It goes without saying that sooner or later your coffee will get cold and you will want to warm it up again. I think I'll just keep doing what I've been doing (microwave and dishwasher) as all 4 have lasted over a year. If they break, I'll have to buy more, of one brand or another.